I have a 99 Silverado. I pull a 30ft travel trailer and it vibrates
some when I take off. I'll be interested to hear what the group says
about yours, as it might apply to mine as well. Mine is 2WD though.
(5.3L, tow package, auto) Good luck!

Is it just when you launch...(0-25 mph)? If so, and you have
a two piece driveshaft, there is a bulletin to address the problem.
Basically, you change the two piece driveshaft to a one piece
driveshaft.
Other then that, you might want to check your u-joints. See a lot
of them on these trucks just go dry and sieze up.
Ian

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